Door-check.



R. E. I. NOHDQUIST.

DO0R CHECK.

APPLICATION FILED APR. 26. 1915.

Patented Sept. 1l', 1917 QQ" N W being inserted in the N unirnn srarnsarriver nieren RONALD E. J. NORneUisT, or OAK PARK, ILLINOIS, ASSIGNORTO THE NILES IN- VISIBLE DOOR CHECK COMPANY, OF NILES, MICHIGAN, ACORPORATION F MICHIGAN.

Ihiil.

.To all whom t may concern:

Be it known that I, RONALD J. Nonn- Quis'i, a subject of the Kil'ig`oit' Sweden, re= siding at Oak Park, in the county of Cook and State ofIllinois, have invented a certain new and useful Improvement in Door-Checks, of whichV the following is a speciiication. i,

This invention relates to Vdoor checks and is an improvement upon theinvisible door checks shown4 in several prior patents. The object of theinvention is to provide a novel form of vaive device controlling theopening or passageway within the lcheek through which liquid flows inthe usual manner, to control the movement oit' the door, this valvedevice being' so arranged that while a ormal speed of door movement ismaintained under ordinary conditions the valve may, under eXtremepressure upon the door, yield to allow a more rapid movement of the doorand thus avoid injury to the checking device; this in combination withautomatic means for varying the normal opening of the valve and withmeans operatable from out` sidethe `device for adjusting said opening`The invention consists in a device capable of carrying out the foregoingobjects which can be very easily and cheaply made andinstalled, which issatisfactory in operation and is not readily liable to get out of order.Theinvention further consists in the teatures and details ofconstruetionhereafter vmore fully set forth in the specification and claims.

In the drawings,

Figure l'is a sectional view of mechanisml illustrating this inventionapplied to a door,

the door being shown in closed position. i

Fig. 2 is an enlarged detail view of the right hand portion of Fig. l;the inner end of the check showing the parts in the posi? tion whichthey assume when the door is open.

Fig. 3 is a view corresponding` to Fig. 2, showing` the parts inintermediate Aposition between that of Figs. l and 2.

Fig. 4l is a sectional detail view onthe `line lh, of Fig. 2, and

Fig. 5 Fig. 3. y y

As inail door checks of this class, the mechanism includes a pair ofplates l() vand l2, placed opposite to each other, the former door j amb14, the latis an end view on theline 5-5, of

Specification of Letters Patent.

DOOR-CHECK.

ratemea sept. ii, iai t'.

Applieatin filed April ze, 1915. serial No. 24,140.

ter in the door` 16, and the plate l2 carryingl the door check caseconsistingI broadly oi the housing` 18, tubular member and closing cap22, of ordinary construction. Similarly, 'as in the old art, the checkhas a piston rod 2l slidable through a suitable packing 26 in the lefthand end of the check, the left end of this rod 24 being connected by alink 28 to a post 80 on plate l0, the result being that as the door 16is swung on its hinges forward and backward from closed to openposition, the rod 24C is reciprocated backward and forward within thecheck cass ing between the positions of Figs. l and The packing 2G isspaced from the piston rod 24, 'and paekingglands 26 and 2Gb are securedin. each end of the packing 26 around the piston rod, thereby forming achamber 26C around the piston rod between the said glands, so that theoil which may seep through in the course oi time, instead of escapinginto the outside atmosphere, where it will 'gum and harden, is caught inthe said cham-ber. Such oil as does pass into the chamber, moreover,serves to lubricate the piston rod, 'and is likely to pass out of thechamber and back i-nto the casing oi? the check. This packing is, toanything in the prior art and tends to keep the check in working orderfor a much longer period of time than has been possible with anyconstruction heretofore known.

In the device illustrating this invention in its vpreferred form hereshown, an internal head 32 is rigidly attached te the inner right handend oi the casing 20 and parts 1S and 32 are connected together withinthe casing by two oppositely placed tubular members 34 and 36. Inclosingthese two tubular members, just mentioned, are coiled springs 3S andbearing at one end against member 1S and `at the other end against aflange or crosshead 42 carried cn the end of an inner cylinder i4 screwthreaded onto the right hand end of piston rod 24k at 4G, the resultbeing that, under normal conditions, the springs 3S and 4L() press thecross-head 42 and consequently the cylinder 44 and rod 24; to the right,as viewed in the `figures, until all of the parts reach the position ofFig. l and the door is closed; in other words, springs 3S and 40 are thedoor control springs.

,Through 'the left hand end or head of cylinder 44 is a port orpassageway 48-50 controlled 'by a ball valve'52. Rigidly attached llO tothe internal head 32, heretofore referred to, by any suitable means,such for instance as screw threads 56, is a cylinder 58 concentric withcylinder 44 but loose enough inside of movable cylinder 44 so that thelatter may freely slide over this cylinder 58. About the left hand endor head of this inner cylinder 58 is a packing device 60 of any suitable construction, while through the center of this head is a port orpassageway 62. Cylinder 58 is provided with a discharge port 66 andcylinder 44 is provided with a similar port 68, permitting oil or otherworking iiuid which'has passed from left to right through passageway 62,in the manner hereafter de scribed, to return into the main interiorchamber of the check case, ready to be used again in the manner wellknown in the art.

The outer or right hand end of head 32 is provided with a suitablyformed recess 70 within which is located a lever 72 pivoted at 74.Through this lever 72 near pivot 74 is inserted a valve rod 76 providedat its right hand end with a head 78 which bears against the lever 72and at its opposite end with a point 8O entering and moving withincylinder 58 and adapted to control the right hand end of passageway 62,heretofore described. On this valve rod 76 near its left hand end is ashoulder 82 and between this shoulder and the adjacent member 32 andwithin the cylinder 58 is placed a coiled spring 84 which, in theobvious manner, tends to force valve rod 76 to the left, as viewed inthe figure1 and consequently force the point 80 of said rod to seatitself in, and close the end of passageway 62.

Pivoted at 90 in the head 32 is a lever 92 having a hooked end 94engaging and bearing against the lower end of lever 72, and an oppositeend carrying a cam 96 lying inside of tube 36, heretofore referred to,adapted to be engaged by a cam lug'98 mounted upon cross-head 42 andtraveling backward and forward along the bottom edge of turbe' 36, thecam lug 98 entering said tube through a suitably formed 96 and cam lug98 are so arranged, shaped and located that when the parts are in thepositions of Figs. 1 and 2, the lever 92 is not materially affected bythe cam but that when the parts are in the position shown in Fig. 3,member 98 engages cam 96 and eleva'tes it as shown in Fig. 3, thusrotating lever 92 in a clockwise direction about pivot 90 and thuscorrespondingly rotating lever 72 about pivot 74. This movement of lever72 obviously moves head 7 8 on valve rod 76 to the right therebywithdrawing point 8O of rod 7 6 from its seat thus increasing the amounto-f liquid which can flow through passageway 62.

Extending through the inside of tube 34, heretofore described, is a rod110 carrying on its left hand end a head 112 provided with slot 100therein. This cam,

a screw driver notch 114 adapted to be engaged by a screw driver in thehands of an operator standing at the edgeof the door. Other means foradjustably rota-ting this rod 116 may be provided withoutdeparting fromthis invention. Means1 such as the ring 116, isvprovided for preventinglongitudinal movement of rod 110 without interfering with its rotation.Suitable packing devices 120 may also'be provided for this rod 110 whenand if desired.

The right hand end 122 of rod 110 is made non-circular in cross-sectionand it enters a block 124 screw threaded at 126 into head 32. The resultof the foregoing construction is that an operator, by turning head 112of rod 110, may turn block 124 and cause it to move in and out of member32 on screw threads 126.

Screw threaded into block 124 is a bolt 130` whose non-circular head 134lies in the U- shaped recess formed in the upper end of lever 72, thefit of the parts being such that the lever 72 may freely` rock on pivot74 so long as the bolt head 134 is in its normal position shown in Fig.5, but the screw or bolt 130 can not be rotated; in other words, thismeans is provided for holding bolt 130 stationary while block 124 isrotated and consequently the relationship longitudinally of the bolt andblock is regulated. Extending transversely of the bolt` 130 arehorizontal arms 138 against which the lever 72 bears.

From the foregoing, it is seen that the arms 138 on bolt 130 form a stoplimiting the movement of the upper end of lever 72 to the left and thatthe position of this stop is adjustable by the operator outside the doorwho applies a screw driver to the notch 114 in head 112 on rod 110 androtates it in the direction desired to vary the rela` tive positions `asmay be needed of the block iai and the boit iso. n

In the operation of the device, the'entire interior of the exterior case18-20-22 is substantially filled with checking liquid, usually oil.Assuming the parts are in the position of Fig. 1 and the operatorpresses against the outside of the door16 to open it. This, in theobvious manner, well known in the art, pulls rod 24 and cylinder 44 tothe left, as viewed in Fig. 1 until the parts, after passing theposition of Fig. 3 reach that of Fig. 2, in so doing compressing'springs 38 and 40. During this movement, the oil or other checkingliquid freely flows through passageway. 48, past ball 52 and throughpassageway 50 into the interior chamber 144 of cylinder 44, closed bythe left hand end or head of cylinder 58 within whichV passageway 62,heretofore referred to, is located.

When, now, the operator releases the d-oor, and it begins to` close,either throughthe compressed springs 38 and 40, or through the-agency ofan external spring forming no part of this invention or through pressureby the operator himself, this'closing pressure tends to force cylinder44 back overcylinder 58, but this movement can only take place asrapidly as the liquid in space 144 in cylinder 44 can flow throughpassageway 62 and its right hand end controlled by point 80 of valve-rod 76. Whenfthe parts are in the position shown in Figs. l and `2,-lever 2 is in such a position that valve rod 7G is pressed by spring 84as far as it will go to the left with the result that the dischargeopening 62-80 is as small as it is desired to e made, and the door will,therefore, in this position yof the parts close as slowly as theoperator of theI device intended it should close, except as the ultimateposition of lever 72 is regulated by the turning of rod 110 andconsequently bolt 130 in the manner heretofore described, to adjust theposition of stop 138. In this position of the parts the door will closesl-owly under the action of the check for the reason that the spring 84is of sufficient strength to, under normal conditions, force the point80 of rod 76 as far as it will go toward the discharge opening ofpassageway 62. This spring 84 is, however, sufiiciently weak so thatwhen an excessive pressure is applied to the door itself therebycreating an excessive pressure in chamber 144, this latter excessivepressure will be applied to the stream of liquid going out of passageway62 with the result that valve rod 76 is forced to the right and theopening 62`80 is enlarged to its maximum.

Vhen member 98, heretofore referred to, reaches the position of Fig. 3,it, in engagement with cam 96, rotates lever 92 in a clockwise directionfrom that of Fig. 2 and correspondingly moves lever 72 with the resultthat head 78 on valve rod 76 is moved to the right. The movement of thisrod under spring 84 to the left is correspondingly limited by theposition of lever 72, and this lever, therefore, prevents point 8O ofrod 76 entering the end of passage 62 as closely as is shown in Figs. 1and 2l with the result f that the heretofore described normal opening ofpassage 62-80 is correspondingly temporarily increased. In practice, thecam 96 is so shaped and the member 98 is so located that this enlargedopening is maintained during the portion of the swing of the door whenit is most desirable that it close rapidly.

It will be seen from the foregoing that by this device the normaldischarge area of the passagewayl controlling the checking fluid isautomatically varied in size as the door moves; that the valve isautomatically relcasable when an excessive pressure is exerted upon thedoor, and that the valve is adjustable at all times from outside thedevice.

`bination of a casing,

of said second-named It will, of course, be understood by those skilledin the art vthat the checking liquid, after passing to the right throughpassageway 62 and past valve point 80, return via ports 66 and 68 to themain chamberl of the check.

By adjusting rod 1104so that valve 62-80 conipletely closes, the doormay be secured by the check in any selected open position.

Having .thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a door check and closer, the coma fluid discharge port orpassageway in said casing, a valve controlling the said port, meanstending to move the valve toward said port, a pivotallymounted leverhaving an operative connection with said valve, and a second leverpivotally mounted in said casing one end of which is operatively engagedwith the firstnamed lever while its other end is free.

2. In a door check and closer, the combination of a casing, a iuiddischarge port or passageway in said casing, a valve controlling saidport, means tending to move the valve toward said port, apivotallymounted lever having an operative connec-- tion with saidvalve, a second lever pivotally mounted in said casing one end of whichis operatively engaged with the firstnamedlever while its other end isfree, a cam on the free arm of the second-named lever, and means havingcoperative engagement with said cam for operating said lever.

3. In a door check and closer, the combination of a casing, a fluiddischarge port in said casing, a valve for said port, means tending tomove the valve toward said port, a pivotally-mounted lever havingoperative connection with said valve,` a slot in one end of said lever,a second pivotally-mounted lever the short arm of which passes throughsaid slot and has operating connection with the first-named lever, a camon the long arm lever, and means havlng coperative engagement with saidcam or operating said levers.

In a door check and closer, the combination of a casing, a fluiddischarge port in said casing, a valve for said port, means tending tomove said valve toward said port, a pivotally-mounted lever havingoperative connection with said valve, an abutment for one end of saidlever for determining the movement of said lever, means extendingfromsaid abutment through the casing an to the exterior of the casingwhereby the abutment may be adjusted from the exterior of the casing, alever pivotally mounted in the casing with 'its short arm havingoperative engagement with the first-named lever, a cam on the long armof the secondnamed lever, and means cooperative with said cam to operatethe rst-named lever.

5. In a door cheek and closer, the combination, with thefluid-controlling valve within a easing and a lever to control saidvalve, of an abutment to limit the movement 5 of said lever, said(butment comprising ascrew-threadedv block, an abutment screwthreaded insaid block and adapted to be vengaged by said lever and when so enga edis held against rotation, a rod non-rotatably i0 connected with saidblock and extending to the exterior of the Casing whereby it may berotated and in turn rotate the block and Gopies o! this patentmay heobtained for ve cents thereby regulate the distanoersaid abutmentprojects from saidblock and thus regulate the extent of movementofsaidlever, said 15 adjustment being made exterior of the door in which theCheck and closer is positioned. In witness whereof, I `have hereuntosubT scribed my name in the presence of twol witnesses. a

RONALD E. J. NORDQUIST.

Vitnesses y DWIGHT B. CHEEVER, `M. S. RosENzwEIG.

each, by ddxeseing the Commissioner of Intenta,

Washington, D. G."

